I spent most of my life in Sutton and have seen some radical changes over the years. I don't know what age your children are but the Infant and Junior schools that I attended have long since been pulled down; which was a great shame - the infant school even had a little bell tower. Not sure about the Junior schools there now but there are some decent Senior schools.
The 'greenest' borough tag came about by the (then) radical Liberal Democrat local Council's environmental policy. I believe they were the first to implement house to house recycling schemes, gas powered offical vehicles (a few of them, anyway) and they even gave me a break (and an award) on the rent for the cafe I ran there with a chum (in Grove Park); because we were veggie/organic/wholefood recycling bunnies. Anyway, I think, just now, a lot of funding for certain schemes looks set to be taken away. Most of the people - green activists - who kind of steered the Council to their green agenda have moved on to, erm . . greener pastures.
The town of Sutton has doubled (that's being conservative) in size over the years and the small town feel has faded. Carshalton still has little enclaves where one can pretend to be in a village and so has Cheam (which boasts Nonsuch Park - the site of Henry V111's old pleasure palace and hunting grounds). House prices are, of course, way out of control and that isn't going to change anytime soon.
The night life is, unfortunately like most other towns and cities across the UK , geared-up for the 20 something market and their insatiable appetite for alcohol. There are two night clubs countless pubs and the High Street isn't a very salubrious place to be later in the night.
Having said that there is a large theatre (and one in Carshalton, too), various clubs and societies (inc. film/theatre/writing/rambling/folk clubs) and probably one of the best public Libraries (Sutton Central Library) in the country.
On the fast train from Sutton you can get into the City in about 20 mins to half an hour. Morden is the southern terminal of the Northern line (always bring reading matter when using this line); buses between the two towns (and everywhere else) are frequent.
I am typing this in Morden, at the moment (back to Bushey tonight) and this town - although very grubby-looking and run down when you are in the high street - has things going for it; some great parks - not far from Wimbledon, good schools and such (I think I am right in saying that it boasts one of the biggest Mosques in the country).
I guess that if one can't actually get to live in a real village then one must hunt for little enclaves where one can. I believe that the address for the coucil web site is : newcomer link: http://www.sutton.gov.org [nonactive] - or a variation of that anyway.
If I can think of anything else I'll add it later (should be working) - Sutton's okay, still but avoid Rose Hill like the plague.